Hi Maria,

after my identification experience, and after my checking of literature in our laboratory. I see, that it is a very small Gymnodinium species, after my identification it seems to be Gymnodinium cf. ordinatum Skuja 1939. It is needed to see this species also from the dorsiventral view. The most important diacritical characteristics: Epivalva is a little bit bigger than hypovalva. The cells are symmetric, broadly oval, 12-15 micrometer long and 11-13 micrometer broad. There are also mentioned chromatophores in literature Gottfried Huber-Pestalozzi & Bohuslav Fott (1968): Das Phytoplankton des Süßwassers, Systematik und Biologie, 3. teil, Cryptophyceae, Chloromonadophyceae, Dinophyceae. Stuttgart, E. Schweizerbart´sche Verlagsbuchhandlung (Nägele u. Obermiller), p.137-138.

I hope that It will help you a little bit :-)

best wishes

Bohuslav

Thank you so much for your answer Bohuslav Uher, all information helps.

My Gymnodiniums are biger: 18-19 x 17 micrometer more o less, i was thinking  perhaps in Gymnodinium cnecoides

Jiri Popovsky and Lois Ann Pfiester (1990): Dinophyceae (Dinoflagellida) . Gustav Fischer Verlag. Stuttgart. p. 103-104

Best wishes

Maria 

I'm not specialis in this area.